EP0346970A1 - Circuit pour mesurer la capacité d'une batterie - Google Patents

Circuit pour mesurer la capacité d'une batterie Download PDF

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Publication number
EP0346970A1
EP0346970A1 EP89201462A EP89201462A EP0346970A1 EP 0346970 A1 EP0346970 A1 EP 0346970A1 EP 89201462 A EP89201462 A EP 89201462A EP 89201462 A EP89201462 A EP 89201462A EP 0346970 A1 EP0346970 A1 EP 0346970A1
Authority
EP
European Patent Office
Prior art keywords
battery
circuit
measuring
capacity
capacitor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP89201462A
Other languages
German (de)
English (en)
Other versions
EP0346970B1 (fr
Inventor
Teruo Hishiki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=15400355&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0346970(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Gloeilampenfabrieken NV
Priority to AT89201462T priority Critical patent/ATE95315T1/de
Publication of EP0346970A1 publication Critical patent/EP0346970A1/fr
Application granted granted Critical
Publication of EP0346970B1 publication Critical patent/EP0346970B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/005—Circuits for altering the indicating characteristic, e.g. making it non-linear
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/374—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] with means for correcting the measurement for temperature or ageing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
    • G01R31/3828—Arrangements for monitoring battery or accumulator variables, e.g. SoC using current integration
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
    • G01R31/3828—Arrangements for monitoring battery or accumulator variables, e.g. SoC using current integration
    • G01R31/3832—Arrangements for monitoring battery or accumulator variables, e.g. SoC using current integration without measurement of battery voltage

Definitions

  • the present invention relates generally to a circuit for measuring a capacity of a battery, and more particularly to such a circuit which is suitable for use for measuring an energy capacity of a battery comprising detection means for detecting a current flowing through the battery and an integration circuit for integrating an output of the detection means, the measuring circuit measuring the capacity of the battery in accordance with an output of the integration circuit.
  • a measuring circuit of this kind is used, for example, in an electric or an electronic apparatus with a rechargeable battery, such as a rechargeable shaver, to obtain the amount of energy that is charged into or discharged from the battery.
  • a measuring circuit of the conventional type in whcih the energy charged into or discharged from a battery is obtained based on the measurement of a charge or a discharge time.
  • the amount of energy charged into or discharged from a battery is obtained by integrating a measured charge or discharge current.
  • the charge and discharge currents are measured based on a voltage appearing across a resistor which is connected in series to the battery.
  • the voltage across the resistor is amplified and then integrated, and each time the integration value reaches a predetermined value a pulse is produced with the integration value being reset to zero.
  • the above operation is repeated while the battery is charged or discharged, so that the energy charged or discharged can be measured by counting the pulses thus produced.
  • An example of such a measuring circuit is disclosed in German Patent Application No. 2,313,566.
  • a rechargeable battery such as a Ni-Cd battery
  • a rechargeable battery has such a characteristic that the energy capacity thereof varies with the variation of the ambient temperature as shown, for example, in Fig. 5.
  • This figure shows the relative energy capacity C E as a function of its temperature T. More specifically, the energy capacity of the battery is larger in a temperature range above room temperature, and decreases when the ambient temperature decreases below room temperature as appreciated from the discharge characteris­tic indicated by a dotted line in Fig. 5. It will also be appreciated from the charge characteristic, indicated by a solid line in Fig. 5, that the energy capacity of the battery takes the maximum value at around the room temperature and gradually decreases with the increase or decrease of the ambient temperature from the room temperature.
  • the energy capacity of a battery becomes maximum at approximately the room temperature and decreases with the increase or decrease of the temperature therefrom.
  • it will thus be necessary to compensate for the variation of battery capacity wirh the variation of its ambient temperature.
  • the energy capacity of a rechargeable battery of the above type also gradually decreases with the increase of the number of charging and discharging operations, that is to say, with the lapse of time of usage. This is illustrated in Fig. 6 which shows relative static capacity C SN as a function of the number of charge and discharge cycles N C . Therefore, it is also necessary to take into consideration this decrease in energy capacity for a more accurate measurement of energy capacity of a battery.
  • a circuit for measuring an energy capacity of a battery comprising detection means for detecting a current flowing through the battery and an integration circuit for integrating an output of the detection means, wherein the measuring circuit measures the capacity of the battery in accordance with an output of the integration circuit, characterized in that a circuit element for determining an integration time constant of the integration circuit has a temperature characteristic which substant­ially compensates for a temperature characteristic in the energy capacity of the battery.
  • the integration time constant of the integration circuit varies with the variation of the ambient tempera­ture such that the temperature-dependent variation in capacity of the battery is compensated.
  • the indication of the amount of energy charged into or discharged from the battery obtained in accordance with the integration result corresponds therefore very accurate with the actual state-of-charge irrespective of the variation of the ambient temperature.
  • the same principle can be applied to compensate for the aging of the battery, if the circuit element in the measuring circuit is selected to have an age-variation characteristic which substantially compensates for an age-variation in the energy capacity of the battery. The amount of energy charged to or discharged from the battery can then be measured more accurately.
  • Fig. 1 shows an example of a circuit diagram of an embodiment of the capacity measuring circuit in accordance with the present invention, which embodiment is designed as a circuit for obtaining the amount of energy discharged from a battery incorporated in a rechargeable-battery type electric shaver.
  • a rechargeable battery 10 is shown, for example, a Ni-Cd type battery having a nominal output voltage of 2.4 volts.
  • the negative terminal of the battery is connected to ground.
  • the positive output terminal of the battery 10 is connected to one of the terminals of a motor 13 for driving a cutting blade of the electric shaver and is connected via a switch 11 to a voltage converter 12.
  • This converter 12 is provided for elevating or stepping-up an input voltage thereof and has an output terminal which is connected via a resistor 14 to a gate of an FET 15. The same output terminal is also connected to an input terminal of a voltage regulator 16.
  • the drain of the FET 15 is connected to the other terminal of the motor 13, and the source of the FET 15 is grounded via a resistor 17 of a low resistance value.
  • the source of the FET 15 is also connected to an input terminal of a voltage follower 20 which comprises an operational amplifier 18 and an NPN transistor 19.
  • the collector of the transistor 19 is connected to the emitter of an NPN transistor 21 and is connected to ground via a resistor 22 and a capacitor 23.
  • the emitter of the transistor 19 is grounded through a resistor 24.
  • the transistor 21 has a collector connected to an output terminal of the aforementioned voltage regulator 16.
  • the junction point between the resistor 22 and the capacitor 23 is connected to an input terminal of a hysteresis comparator 29 which comprises resistors 25, 26 and 27 and an operational amplifier 28.
  • An output terminal of this hysteresis comparator 29 is connected to the base of the transistor 21 to the input terminal of a buffer amplifier 30.
  • the output signal (a pulse signal) provided by the hysteresis comparator 29 is thereby amplified and is then counted by a counter 31.
  • the capacitor 23 is selected so that the thermal and age-variation character­istics thereof compensate for the thermal and age-variation characteristics of the battery 10, respectively. More specifically, the capacitor 23 has a capacitance which becomes maximum at about the room temperature and decreases with either the increase or the decrease of the ambient temperature therefrom, as seen from its thermal characteristic of the static capacitance in Fig. 2.
  • This Fig. shows the relative change in capacity ⁇ C C as a functionof the temperature T. This temperature characteristic well corresponds to that of the energy capacity of the battery 10 shown in Fig. 5.
  • a multilayer ceramic capacitor for example, is suitable for use as a capacitor having such temperature characteristic.
  • the capacitance of the capacitor 23 preferably gradually decreases with the lapse of time of usage, as indicated by the aged-variation characteristic in static capacitance in Fig. 3.
  • This Figure 3 shows the relative variation of the capacitance ⁇ C/C as a function of the time of usage t. This characteristic well corres­ponds to the age-variation characteristic of the battery 10 shown in Fig. 6.
  • the aforesaid multilayer ceramic capacitor also has an age-characteristic similar to that shown in Fig. 3.
  • the voltage converter 12 steps up the output voltage of the battery 10 and supplies the stepped-up voltage to the gate of the FET 15. Consequently, the FET 15 brought in the conducting state to drive the motor 13, so that a motor current flows through the resistor 17.
  • the voltage which then appears across the resistor 17 is applied through the voltage follower 20 to the resistor 24. Therefore, a current proportional in value to the current through the motor 13 flows through the resistor 24. If it is assumed that the transistor 21 is in a cut-off state, the electric charge in the capacitor 23 is dis.­charged by the current flowing through the resistor 24, so that the voltage across the capacitor 23 decreases at a rate proportional to the magnitude of this current.
  • a pulse signal having a frequency corresponding to the motor current is produced at the output terminal of the comparator 29, which pulse signal is then counted by the counter 31.
  • the frequency of the above pulse signal for the same amount of motor current becomes the lowest when the ambient temperature is at about the room temperature as can be seen from the temperature characteristic of the capacitor 23 shown in Fig. 2, and increases as the ambient temperature increases or decreases therefrom.
  • the count value obtained at the counter 31 therefore represents the amount of energy discharged from the battery 10 in which the variation in discharge capacity thereof with the variation in ambient temperature is compensated.
  • the static capacitance of the capacitor 23 gradually decreases with the lapse of time of usage. Therefore, as the number of cycles of usage increases, the frequency of the pulse signal increases even if the motor current keeps the same value. Thus, in the amount of energy discharged from the battery as represented by the count value at the counter 31, the decrease in energy capacity of the battery 10 by the age-variation characteristic thereof has been compensated.
  • Fig. 4 shows a modified form of the above-­described embodiment.
  • circuits for measuring the discharged energy amount of batteries are shown.
  • the circuits according to the present invention can also be used for measuring the amount of energy charged into batteries, for example, by causing a charging current of the battery 10 to flow through the resistor 17 in Fig. 1 and by replacing the capacitor 23 with a capacitor having such a capacitance that the temperature characteristic thereof substantially compensates for the temperature-dependent charging characteristic of the battery 10.
  • the circuit element for determining the integration time constant is selected to have such a temperature characteristic that it compensates for the temperature characteristic of the battery.
  • the charged and discharged energy can therefore be measured very accurately without the need for a separate temperature compensation with a specific temperature sensor.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Tests Of Electric Status Of Batteries (AREA)
  • Measurement Of Current Or Voltage (AREA)
  • Secondary Cells (AREA)
EP89201462A 1988-06-14 1989-06-08 Circuit pour mesurer la capacité d'une batterie Expired - Lifetime EP0346970B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89201462T ATE95315T1 (de) 1988-06-14 1989-06-08 Schaltkreis zum messen der kapazitaet einer batterie.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP146109/88 1988-06-14
JP63146109A JPH01313783A (ja) 1988-06-14 1988-06-14 電池の容量計測回路

Publications (2)

Publication Number Publication Date
EP0346970A1 true EP0346970A1 (fr) 1989-12-20
EP0346970B1 EP0346970B1 (fr) 1993-09-29

Family

ID=15400355

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89201462A Expired - Lifetime EP0346970B1 (fr) 1988-06-14 1989-06-08 Circuit pour mesurer la capacité d'une batterie

Country Status (8)

Country Link
US (1) US4931737A (fr)
EP (1) EP0346970B1 (fr)
JP (1) JPH01313783A (fr)
KR (1) KR910001399A (fr)
CN (1) CN1016288B (fr)
AT (1) ATE95315T1 (fr)
BR (1) BR8902773A (fr)
DE (1) DE68909502D1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0484567A1 (fr) * 1988-07-13 1992-05-13 Electronic Development, Inc. Appareil pour surveiller l'état d'une source d'énergie électrique
FR2682830A1 (fr) * 1991-10-18 1993-04-23 Gen Electric Cgr Dispositif de chargement electrique d'un banc capacitif.
ES2036958A2 (es) * 1991-04-20 1993-06-01 Bosch Gmbh Robert Dispositivo para la determinacion del estado de carga de una bateria recargable.
GB2331639A (en) * 1997-11-25 1999-05-26 Rohm Co Ltd Current detector for battery charger
US6133713A (en) * 1998-07-09 2000-10-17 Black & Decker Inc. Method for charging batteries
US6920404B2 (en) 2000-09-28 2005-07-19 Japan Storage Battery Co., Ltd. Method of detecting residual capacity of secondary battery

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US5284719A (en) 1992-07-08 1994-02-08 Benchmarq Microelectronics, Inc. Method and apparatus for monitoring battery capacity
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CN1039660A (zh) 1990-02-14
EP0346970B1 (fr) 1993-09-29
BR8902773A (pt) 1990-02-01
JPH01313783A (ja) 1989-12-19
KR910001399A (ko) 1991-01-30
DE68909502D1 (de) 1993-11-04
ATE95315T1 (de) 1993-10-15
US4931737A (en) 1990-06-05
CN1016288B (zh) 1992-04-15

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